Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 37 for “"Time division multiple access"”.
-
Ss/tdma Time Slot Assignment With Generalized Switching Modes
A number of problems which arise from the time slot assignment problem for satellite communications using the satellite-switched time division multiple access (SS/TDMA) method are studied. Given an m x n real matrix T, and a set of (0, 1)-matrices {Z(,1), Z(,2), (.)(.)(.) , Z(,(nu))}, the …
-
Slow frequency and time hopping in wireless communication
… scheme called SFH/TDMA (Slow Frequency Hopping/Time Division Multiple Access). Comparing the performance of SFH/TDMA with that of CDMA (Code Division Multiple Access) is a problem of both practical and theoretical interest. We contribute to the understanding of the problem by comparing a …
-
Inter-LAN services over broadband satellite systems
… Reservation Protocol (RSVP) to support both real-time and non-real time traffic. We propose a Medium Access Control (MAC) protocol for broadband satellite Inter-LAN services with a special emphasis on the convergence sublayer. In order to efficiently utilize the satellite resources in serving …
-
Low computational complexity bit error rate simulation for personal communications systems in multipath and fading environments
… the performance of future wireless digital multiple access standards for fast and slow moving vehicles in outdoor environments. Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA) are both multiple access techniques for wireless systems that can support …
-
Simulation Study of Local Multipoint Distribution Service
… to examine the performance of two different multiple access schemes and two different duplexing schemes. LMDS is a broadband wireless point-to-multipoint access network that aims to improve network access capacity for end-users by solving the "last mile" problem. This study involves building …
-
Impact of processing energy on the capacity of wireless channels
… perform our study in terms of power per unit of time, or energy. Traditional in- formation theoretic energy constraints consider only the energy used for transmission purposes. We study optimal transmission strategies by explicitly taking into account the energy expended by processes other than …
-
Design of Media Access Control Schemes for Performance Enhancement of Future Generation Wireless Systems
… resource. WLAN devices utilize a complex medium access control (MAC) mechanism to allow multiple users to share the wireless resource. The distributed coordination function (DCF) is the most commonly used multiple access scheme in WLANs and a member of the 802.11 standard [1]. In this thesis, two …
-
Integration of Wireless Sensor Network with CubeSat Satellite System for Enhanced Agricultural Monitoring
… protocol that combines randomized backoff with a Time Division Multiple Access (TDMA) style slotting. A simulation was developed that shows a gateway discovery model (effective slot budget B, per-window randomized access, deterministic polling once discovered) with an implementation of a …
-
Frame synchronisation methods for digital satellite system
… four specific areas, namely, Satellite-Switched Time-Division Multiple-Access (SSTDMA) network synchronisation, frame synchronisers, remote sensing satellite data decommutating systems, and prototype frame synchroniser implementation. In the area of SSTDMA network synchronisation, this thesis …
-
Fast Chirped Signals for a TDMA Ultrasonic Indoor Positioning System
… In order to incorporate more transmitters, a time-division multiple access (TDMA) scheme is applied to ensure orthogonality of signals. The concept includes four ultrasonic transmitters and a single receiver, which can uniquely identify each transmitter by a distinct signal sweep. Linear chirp …
-
Optimum linear single user detection in direct-sequence spread-spectrum multiple access systems
… proposal of the IS-95 standard, <i>code-division multiple access</i> (CDMA) gained popularity as an alternative multiple-access scheme in cellular and <i>personal communication systems</i> (PCS). Besides the advantage of allowing asynchronous operation of the users, CDMA …
-
Design of the control systems operations for the Iridium satellite system
… Groupe Speciale Mobile (GSM), a combination of time division mUltiple access, TDMA, and frequency division multiple access, FDMA, is recommended for use by Iridium. A bus topology with a fiber backbone is suggested to support the operations at each facility and a separate landline is considered …
-
Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots
… messages based both on overall importance and time sensitivity; 3) Time Division Multiple Access (TDMA) Medium Access Control (MAC) with automatic discovery; and 4) an abstract acoustic modem driver. Building on this networking framework, two approaches that use the vehicle’s “intelligence” to …
-
Optimal Hybrid MIMO Beamforming Designs for Energy-Efficient Communication Systems
… the carbon footprint. In this context, hybrid multiple-input multiple-output (MIMO) beamforming designs emerge as a crucial solution for achieving energy-efficient communication systems. These designs leverage low-complexity, low-cost, and low-power applications, primarily due to the use of …
-
Optimisation and algorithms in wireless networks for mission critical applications
… two interfering users in an Orthogonal Frequency Division Multiple Access (OFDMA)-based cooperative base stations and (b) event-region detection in Wireless Sensor Networks (WSNs). The first area of work makes contribution on problem of maximising the sum rate of two interfering users, while …
-
Performance evaluation of multimedia satellite communications systems using on-board packet switches
… are ideally equipped to provide future multimedia services on a global level and at a distance-independent cost. In order to meet the ever-growing bandwidth demands of these new applications, satellites employing multiple spot beam antennas are required. An on-board packet switch is an …
-
Multiple access protocols for multichannel communication systems
… In this thesis, we introduce the concept of multiple access communication and the need to use efficient transmission techniques to expand both present and future wireless communication networks. We will study two areas regarding multiple access on multichannel communication systems. First, we …
-
Advances in integrating autonomy with acoustic communications for intelligent networks of marine robots
… messages based both on overall importance and time sensitivity; 3) Time Division Multiple Access (TDMA) Medium Access Control (MAC) with automatic discovery; and 4) an abstract acoustic modem driver. Building on this networking framework, two approaches that use the vehicle's "intelligence" to …
-
Iterative Detection and Decoding for Wireless Communications
… of problems: the detection of turbo codes over time-varying channels, and the distributed detection of coded multiple-access signals. Because turbo codes operate at low signal-to-noise ratios, the process of phase estimation and tracking becomes difficult to perform. Additionally, the turbo …
-
Guaranteeing Communication Quality in Real World WSN Deployments
… of the widely used approaches to coordinate access to the communication medium. This thesis also argues that the currently employed solutions at the MAC layer are insufficient to provide guarantees to the resource user. Therefore, we introduce Reins-MAC, a Time-Division Multiple-Access (TDMA) …
Page 1 of 2